编辑虚拟主机文件 /etc/nginx/conf.d/default.conf 在server段添加如下配置
if ($time_iso8601 ~ "^(\d{4})-(\d{2})-(\d{2})"){ set $year $1; set $month $2; set $day $3; } access_log /data/logs/app_$year-$month-$day.log main;
原文：http://www.cnblogs.com/chenjiahe/p/5841439.html